Q: new recovery tank did not extinguish low coolant lite on 2001 GMC Sierra 2500 HD

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low coolant is constant. I have plenty of coolant in tank. I replaced the recovery tank, but light is still on.
(1) Answer
ON many newer GM vehicles, the low coolant light is controlled by a module that is on the radiator. It has 3 wires and is usually below the radiator neck. Look for it.

Also, I would go to and get a subscription for your Truck, its very reasonable. That way you will have pictures and all the info that you need. Then you will know.